Think I got a bit confused and thought the waiting around was mainly at the docks themselves.
Put a question on the other post about what ADR would be best to go for but repeat it here just in case other post is not seen?
Core + (tanks or packages or both) + all classes or just certain ones. 
Bearing in mind I only intend to work on containers so any classes that would never be carried this way i’d happily avoid doing. I know TipperDipper has said core and tanks but I thought packages covered small tanks, barrels etc… Would larger tanks be carried in containers that go over the threshold for packages?
Cheers.